Question

A quadratic equation has two equal roots, if ......,select a proper option (a), (b), (c) or (d) from given options so that the statement becomes correct.
(a) D< 0
(b) D> 0
(c) D = 0
(d) D is non-zero perfect square

Answer 1

It's option c
(c) when the discriminant =0
only then the quadratic equation has 2 equal roots
Hope this helps you....

Answer 2

(c)D=0 is the correct answer.